[PATCH 5.10 075/406] selftests/resctrl: Close perf value read fd on errors

Greg Kroah-Hartman
2023-09-17T19:22:34Z

From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

[ Upstream commit 51a0c3b7f028169e40db930575dd01fe81c3e765 ]

Perf event fd (fd_lm) is not closed when run_fill_buf() returns error.

Close fd_lm only in cat_val() to make it easier to track it is always
closed.

Fixes: 790bf585b0ee ("selftests/resctrl: Add Cache Allocation Technology (CAT) selftest")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Tested-by: Shaopeng Tan (Fujitsu) <tan.shaopeng@fujitsu.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
tools/testing/selftests/resctrl/cache.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
index 5922cc1b03867..b3c0e858c4e07 100644
--- a/tools/testing/selftests/resctrl/cache.c
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -89,21 +89,19 @@ static int reset_enable_llc_perf(pid_t pid, int cpu_no)
static int get_llc_perf(unsigned long *llc_perf_miss)
{
__u64 total_misses;
+ int ret;

/* Stop counters after one span to get miss rate */

ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0);

- if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) {
+ ret = read(fd_lm, &rf_cqm, sizeof(struct read_format));
+ if (ret == -1) {
perror("Could not get llc misses through perf");
-
return -1;
}

total_misses = rf_cqm.values[0].value;
-
- close(fd_lm);
-
*llc_perf_miss = total_misses;

return 0;
@@ -256,17 +254,23 @@ int cat_val(struct resctrl_val_param *param)
memflush, operation, resctrl_val)) {
fprintf(stderr, "Error-running fill buffer\n");
ret = -1;
- break;
+ goto pe_close;
}

sleep(1);
ret = measure_cache_vals(param, bm_pid);
if (ret)
- break;
+ goto pe_close;
+
+ close(fd_lm);
} else {
break;
}
}

return ret;
+
+pe_close:
+ close(fd_lm);
+ return ret;
}
--
2.40.1